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<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>辅助工具 响应式</title>
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</head>
<body>
    <div class="container">
        <p class="text-muted">text-muted</p>
        <p class="text-primary">text-primary</p>
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        <button class="caret"></button>
        <p class="visible-sm-block">visible-sm-block</p>
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    <div class="alert">
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        <strong>Warning!</strong> Best check yo self, you're not looking too good.
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</body>
</html>